Orange / Raspberry AFRNClient image probably work really well and is a low-power I have tested, weather condition tests of these devices. 2 - year ip67 - in a shielded case and no rust or use problems.

and installation is easy if you just understand the Linux commands and also have very low power systems.

2018-09-14, Revision 5208:- New version of AlterFRN server :- Improved handling of multiple responses from multiple FRN System Manager in Light mode (s.1.10.3) and FRN mode (s.1.10.4) ;- Added the ability to limit the duration of the client connection, as for the server as a whole: server parameter ClientSessionMaxTime (s.1.16) , and for a particular network (room): network option ClientSessionMaxTime (s.4.15) ;- The parameter ManagerInvalidPasswordScript (s.1.17) was added to specify the name of the external program (script) that will be started asynchronously when the "Wrong password" error is received from the FRN System Manager , which makes it possible to automatically request a new static password with the register command (0.4.12) for AlterFRN client;- Added commands setmanpassidx (s.0.9) and setmanpassaddr (s.0.10) to set a new password for connecting the server to the FRN System Manager ;- Added option Hidden (s.4.16) for the network (room), which allows to exclude such a network (room) from the list of networks (rooms) - it became possible to create invisible networks (rooms);- Added the LogExec (s.3.4) parameter in the [ System ] section (s.3) to enable logging of the start of external programs (scripts);- Added the ability to have more than one owner for the network (room); see also the option of the network (room) OwnerEMail (s.4.1) ;